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If a creditor reports to all three bureaus, then it will almost always report to all three on the same day.
But... each bureau will take some number of days to update its database with the new info. Thus it would not be strange for one the updated record to appear on one CRA report on day X, but with another bureau it might be 2, 3, even 4 business days after X. I haven't seen a particular pattern with that -- e.g. that one CRA is always much faster than another, say.
Agreed with what was replied above. I've seen all 3 bureaus update on the same day and I've seen up to a week variance between the first and last date that they updated on. It should usually only take another day or two, but could take up to a week to see an update across all bureaus from my experience.